Selenium WebDriver如何解决过时的元素参考异常？ [英] Selenium WebDriver How to Resolve Stale Element Reference Exception?
问题描述
我在Selenium 2 Web驱动程序测试中有以下代码，它在我调试时有效，但是当我在构建中运行它时大部分时间都失败了。我知道它必须与页面没有刷新的方式有关，但不知道如何解决它所以任何关于我做错了什么的指针都很感激。我使用JSF primefaces作为我的Web应用程序框架。当我点击添加新链接时，会出现一个弹出对话框，其中包含一个我可以输入日期的输入框，然后单击保存。它是在输入元素输入文本，我得到一个陈旧的元素引用异常。
I have the following code in a Selenium 2 Web Driver test which works when I am debugging but most of the time fails when I run it in the build. I know it must be something to do with the way the page is not being refreshed but do not know how to resolve it so any pointers as to what I have done wrong are appreciated. I am using JSF primefaces as my web application framework. When I click on the add new link a popup dialog box appears with a input box that I can enter a date into then click save. It is on getting the input element to enter text into that I get a stale element ref exception.
提前谢谢
import static org.junit.Assert.assertEquals;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.junit.Test;
import org.openqa.selenium.By;
import org.openqa.selenium.StaleElementReferenceException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.support.ui.ExpectedCondition;
import org.openqa.selenium.support.ui.WebDriverWait;
public class EnterActiveSubmissionIntegrationTest {
Map<String, Map<String, String>> tableData = new HashMap<String, Map<String, String>>();
@Test
public void testEnterActiveSubmission() throws Exception {
// Create a new instance of the Firefox driver
// Notice that the remainder of the code relies on the interface,
// not the implementation.
System.setProperty("webdriver.chrome.driver", "C:/apps/chromedriver.exe");
WebDriver driver = new ChromeDriver();
// And now use this to visit Google
driver.get("http://localhost:8080/strfingerprinting");
// Alternatively the same thing can be done like this
// driver.navigate().to("http://www.google.com");
// Find the text input element by its name
WebElement element = driver.findElement(By.linkText("Manage Submissions"));
element.click();
parseTableData(driver, "form:submissionDataTable_data", 1);
assertEquals(tableData.get("form:submissionDataTable_data").get("12"), "Archived");
WebElement newElement = driver.findElement(By.linkText("Add new"));
newElement.click();
WebDriverWait wait = new WebDriverWait(driver,10);
wait.until(new ExpectedCondition<Boolean>() {
public Boolean apply(WebDriver driver) {
WebElement button = driver.findElement(By
.name("createForm:dateInput_input"));
if (button.isDisplayed())
return true;
else
return false;
}
});
WebElement textElement = driver.findElement(By.name("createForm:dateInput_input"));
textElement.sendKeys("24/04/2013");
WebElement saveElement = driver.findElement(By.name("createForm:saveButton"));
saveElement.click();
driver.navigate().refresh();
parseTableData(driver, "form:submissionDataTable_data", 2);
//Close the browser
driver.quit();
}
private void parseTableData(WebDriver driver, String id, int expectedRows) {
// Check the title of the page or expected element on page
WebElement subTableElement = driver.findElement(By.id(id));
List<WebElement> tr_collection=subTableElement.findElements(By.xpath("id('"+ id + "')/tr"));
assertEquals("incorrect number of rows returned", expectedRows, tr_collection.size());
int row_num,col_num;
row_num=1;
if(tableData.get(id) == null) {
tableData.put(id, new HashMap<String, String>());
}
Map<String, String> subTable = tableData.get(id);
for(WebElement trElement : tr_collection)
{
List<WebElement> td_collection=trElement.findElements(By.xpath("td"));
col_num=1;
for(WebElement tdElement : td_collection)
{
subTable.put(row_num + "" + col_num, tdElement.getText());
col_num++;
}
row_num++;
}
}
}
当我运行这个时，我得到了以下异常但它可以发生在
When I run this I get the following exception but it can occur on
WebElement textElement = driver.findElement(By.name("createForm:dateInput_input"));
或
if (button.isDisplayed())
异常追踪
org.openqa.selenium.StaleElementReferenceException: stale element reference: element is not attached to the page document
(Session info: chrome=26.0.1410.64)
(Driver info: chromedriver=0.8,platform=Windows NT 6.0 SP2 x86) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 56 milliseconds
For documentation on this error, please visit: http://seleniumhq.org/exceptions/stale_element_reference.html
Build info: version: '2.32.0', revision: '6c40c187d01409a5dc3b7f8251859150c8af0bcb', time: '2013-04-09 10:39:28'
System info: os.name: 'Windows Vista', os.arch: 'x86', os.version: '6.0', java.version: '1.6.0_10'
Session ID: 784c53b99ad83c44d089fd04e9a42904
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities [{platform=XP, acceptSslCerts=true, javascriptEnabled=true, browserName=chrome, rotatable=false, driverVersion=0.8, locationContextEnabled=true, version=26.0.1410.64, cssSelectorsEnabled=true, databaseEnabled=true, handlesAlerts=true, browserConnectionEnabled=false, nativeEvents=true, webStorageEnabled=true, applicationCacheEnabled=false, takesScreenshot=true}]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:187)
at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:554)
at org.openqa.selenium.remote.RemoteWebElement.execute(RemoteWebElement.java:268)
at org.openqa.selenium.remote.RemoteWebElement.isDisplayed(RemoteWebElement.java:320)
at com.integration.web.EnterActiveSubmissionIntegrationTest$1.apply(EnterActiveSubmissionIntegrationTest.java:58)
at com.integration.web.EnterActiveSubmissionIntegrationTest$1.apply(EnterActiveSubmissionIntegrationTest.java:1)
at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:208)
at com.integration.web.EnterActiveSubmissionIntegrationTest.testEnterActiveSubmission(EnterActiveSubmissionIntegrationTest.java:53)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
推荐答案
首先让我们来清楚WebElement是什么。
First of all lets be clear about what a WebElement is.
WebElement是对DOM中元素的引用。
A WebElement is a reference to an element in the DOM.
A当您正在交互的元素是destr时，抛出StaleElementException染色，然后重新创建。如今，大多数复杂的网页会随着用户与之交互而动态移动，这需要销毁和重新创建DOM中的元素。
A StaleElementException is thrown when the element you were interacting is destroyed and then recreated. Most complex web pages these days will move things about on the fly as the user interacts with it and this requires elements in the DOM to be destroyed and recreated.
当发生这种情况时您之前使用的DOM中元素的引用变得陈旧，您不再能够使用此引用与DOM中的元素进行交互。当发生这种情况时，您需要刷新您的参考，或者在现实世界中再次找到该元素。
When this happens the reference to the element in the DOM that you previously had becomes stale and you are no longer able to use this reference to interact with the element in the DOM. When this happens you will need to refresh your reference, or in real world terms find the element again.
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